Queuing Models in NS2

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M/M/1 is a system with poisson arrival time, servicing exponentially and a queue of unlimited capacity and type of FIFO Queue. This is the simplest queuing system.  NS2 supports various distributions like pareto, exponential, constant, unifrom, etc to handle the network dynamics and metrics. So it is very easy to test the given network link to monitor a given queue using any of these queuing models. The listing 3 and 4 are monitoring the link when DropTail queue is used with a capacity of finite and infinite. Listing 13.3 uses infinite capacity and Listing 13.4 uses Finite capacity The output screen shot is shown below the scripts for further understanding
Listing 3 – M/M/1 Queuing Model #new Simulator creation set ns [new Simulator] #trace file creation for capturing the UDP data set tf [open out.tr w] $ns trace-all $tf
#setting the exponential distribution param set lambda 30.0 set mu     33.0
#creation of nodes set n1 [$ns node] set n2 [$ns node] #The queue limit is 1Lakh as the capacity is infin…

Installing Omnet++ in Ubuntu 9.04

  1. Unzip the omnetpp-xxx.zip file in to any folder possibly (/home/pradeepkumar/)
  2. Open the shell prompt and then go to the corresponding folder by issuing the command cd /home/pradeepkumar/omnetpp-4.0
  3. Run the command (./configure)
  4. If you get any errors, please download the concerned files and again go to step 3.
  5. You may get errors like this and execute the command (sudo apt-get install bison flex byacc swig build-essential tcl8.5 tk8.5 tcl8.5-dev tk8.5-dev) after installing all the packages, go to step 3
  6. If path information is being asked, then set the path in the /home/pradeepkumar/.bashrc (export PATH=$PATH:/home/pradeepkumar/omnetpp-4.0/bin)
  7. Add the following line to your .profile or .bash_profile (provided you use bash): export TCL_LIBRARY=/usr/share/tcltk/tcl8.5
  8. After that logout and login and then go to step 2 and then 3.
  9. Execute make command and thats it!!!!
  10. After installing this, for running the IDE, you need to install java run time environment.

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